[Bugfix] Use Seed-TTS reference audio with MiniCPM-o 4.5 (#6628)

Signed-off-by: akshatvishu <akshatnayak197@gmail.com>

tests/benchmarks/patch/test_patch.py

@@ -16,9 +16,14 @@ import pytest
 from pytest_mock import MockerFixture
 from vllm.benchmarks.lib.endpoint_request_func import RequestFuncInput
 
+from vllm_omni.benchmarks.data_modules.seed_tts_dataset import (
+    SeedTTSSampleRequest,
+    SeedTTSTextSampleRequest,
+)
 from vllm_omni.benchmarks.patch.patch import (
     MixRequestFuncOutput,
     _apply_stage0_token_timings,
+    _attach_seed_tts_to_request_func_input,
     async_request_openai_chat_omni_completions,
     async_request_openai_realtime_duplex,
     should_request_stage_metrics,
@@ -28,6 +33,74 @@ from vllm_omni.experimental.fullduplex.client import RealtimeEventCollector
 pytestmark = [pytest.mark.core_model, pytest.mark.benchmark, pytest.mark.cpu]
 
 
+def _seed_tts_request_func_input() -> RequestFuncInput:
+    return RequestFuncInput(
+        model="test-model",
+        model_name="test-model",
+        prompt="target text",
+        api_url="http://test.com/v1/chat/completions",
+        prompt_len=2,
+        output_len=20,
+        extra_body={"modalities": ["text", "audio"]},
+    )
+
+
+def test_seed_tts_chat_request_carries_reference_audio_once() -> None:
+    reference_audio_url = "data:audio/wav;base64,AAAA"
+    sample = SeedTTSSampleRequest(
+        prompt="target text",
+        prompt_len=2,
+        expected_output_len=20,
+        multi_modal_data=None,
+        seed_tts_system_prompt="Clone the supplied voice.",
+        seed_tts_speech_extra={
+            "ref_audio": reference_audio_url,
+            "ref_text": "reference text",
+            "task_type": "Base",
+        },
+    )
+    request_func_input = _seed_tts_request_func_input()
+
+    _attach_seed_tts_to_request_func_input(sample, request_func_input)
+
+    assert request_func_input.omni_chat_messages == [
+        {
+            "role": "system",
+            "content": [{"type": "text", "text": "Clone the supplied voice."}],
+        },
+        {"role": "user", "content": [{"type": "text", "text": "target text"}]},
+    ]
+    assert request_func_input.extra_body["ref_audio"] == reference_audio_url
+    serialized_request = json.dumps(
+        {"messages": request_func_input.omni_chat_messages, **request_func_input.extra_body},
+    )
+    assert serialized_request.count(reference_audio_url) == 1
+
+
+def test_seed_tts_text_chat_messages_do_not_add_reference_audio() -> None:
+    sample = SeedTTSTextSampleRequest(
+        prompt="target text",
+        prompt_len=2,
+        expected_output_len=20,
+        multi_modal_data=None,
+        seed_tts_system_prompt="Use the configured voice.",
+        seed_tts_speech_extra=None,
+    )
+    request_func_input = _seed_tts_request_func_input()
+
+    _attach_seed_tts_to_request_func_input(sample, request_func_input)
+
+    assert getattr(request_func_input, "seed_tts_row", False) is True
+    assert request_func_input.omni_chat_messages == [
+        {
+            "role": "system",
+            "content": [{"type": "text", "text": "Use the configured voice."}],
+        },
+        {"role": "user", "content": [{"type": "text", "text": "target text"}]},
+    ]
+    assert "ref_audio" not in request_func_input.extra_body
+
+
 class MockResponse:
     """Mock aiohttp response for testing"""